中国电机工程学报2017，Vol.37Issue(11)：3348-3358,11.DOI:10.13334/j.0258-8013.pcsee.160242
利用累积能量函数特征参量优化提取的多源局部放电信号分离技术
Separation Technique of Multiple Source PD Signals by Employing Feature Optimization Extraction of Cumulative Energy Function
摘要
Abstract
Multiple partial discharge (PD) resulted from different defects may occur simultaneously in power equipments,and cause the interpretation problems such as pattern recognition and risk assessment of mixed PD sources.In this paper,a mixed partial discharge (PD) signals separation algorithm based on feature optimization extraction of cumulative energy (CE) function was proposed in order to diagnose the insulation condition of equipments.The CE functions in time domain (TCE) and frequency domain (FCE) were calculated to characterize the pulse current and ultra-high frequency (UHF) waveforms and their FFT spectrums,respectively.The mathematical morphology gradient (MMG) operation was applied to the TCE and FCE,and the energy rising steepness features were extracted.The standard deviation of extracted features was adopted to evaluate their separation performance.The length of structure element in MMG was optimized with the goal of maximum separation performance.The energy rising steepness features with optimized SEL was adopted in the separation method.The experiments with three kinds of typical multi-defect models were performed on a 252kV GIS in laboratory,and the separation performance of the proposed algorithm was verified with the acquired mixed UHF signals.Moreover,the algorithm was successfully applied to the separation of multiple PD UHF signals detected from an on-site l l00kV GIS.The separation results indicate that the proposed method is effective for both internal and external sensors,which shows good performance of multiple PD UHF signals separation.关键词
局部放电检测/多源放电分离/时频域累积能量函数/特征参量优化提取/特高频法Key words
partial discharge detection/signal separation/cumulative energy/feature optimization extraction/ultra-high frequency method分类
信息技术与安全科学引用本文复制引用
邵先军,何文林,徐嘉龙,朱明晓,刘浩军,张冠军..利用累积能量函数特征参量优化提取的多源局部放电信号分离技术[J].中国电机工程学报,2017,37(11):3348-3358,11.基金项目
中国博士后科学基金资助项目(2015M580848) （2015M580848）
国家自然科学基金项目(51607140) （51607140）
国网浙江省电力公司科技项目(5211DS15002P).China Postdoctoral Science Foundation funded project (2015M580848) （5211DS15002P）
Project Supported by National Natural Science Foundation of China (51607140) （51607140）
State Grid Zhejiang Electric Power Company Technology Project (5211DS15002P). （5211DS15002P）
